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Segment Information - Unconsolidated Real Estate Ventures of Company's Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | $ 170,361 |  | $ 170,361 |  | $ 194,621
Equity in income (loss) of real estate ventures |  | (358) | $ 1,084 | (1,183) | $ 336 |
Philadelphia CBD [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | 21,230 |  | 21,230 |  | 39,939
Equity in income (loss) of real estate ventures |  | 89 | 45 | (147) | (21) |
Pennsylvania Suburbs [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | 0 |  | 0 |  | 3,503
Equity in income (loss) of real estate ventures |  | 0 | 148 | 0 | 424 |
Metropolitan DC [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | 119,678 |  | 119,678 |  | 119,817
Equity in income (loss) of real estate ventures |  | (363) | (75) | (400) | 392 |
Austin, Texas [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | 14,684 |  | 14,684 |  | 13,973
Equity in income (loss) of real estate ventures |  | 653 | 1,646 | 734 | 1,281 |
MAP Venture [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity | [1] | 12,883 |  | 12,883 |  | 15,450
Equity in income (loss) of real estate ventures | [1] | (830) | (787) | (1,567) | (1,904) |
Other [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Investment in real estate ventures, at equity |  | 1,886 |  | 1,886 |  | $ 1,939
Equity in income (loss) of real estate ventures |  | $ 93 | $ 107 | $ 197 | $ 164 |
[1] | The MAP Venture represents a joint venture, formed on February 4, 2016 between the Company and MAP Ground Lease Holdings LLC, an affiliate of Och-Ziff Capital Management Group, LLC. The MAP Venture’s business operations, including properties in Richmond, Virginia; Metropolitan Washington, D.C.; New Jersey/Delaware and Pennsylvania Suburbs, are centrally managed with the results reported to management of the Company on a consolidated basis. As a result, the investment in the MAP Venture is separately presented. All other unconsolidated real estate ventures are managed consistently with the Company’s regional segments.

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